JPS633434Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Field of Industrial Application] The present invention relates to an improvement of a water turbine guide vane protection device.

[Conventional technology]

Figure 1 shows an example of a conventional guide vane protection device.
This will be explained with reference to FIG.

The insides of the upper and lower covers 1A, 1B form water channels. Runner 3 is installed downstream and upstream in the waterway.
and a plurality of stems 4 are arranged, respectively.
The stem is rotatably supported between the upper cover 1A and the lower cover 1B. One end of the link 5A arranged on the outside of the upper cover 1A is connected to the guide ring 5.
Connected to B. The guide ring 5B is rotated clockwise or counterclockwise by power such as a servo motor 5C. The other end of the link 5A is connected to a guide lever 7 via a connecting pin 6. The other end of the guide lever 7 is inserted into the plurality of stems via a main torque transmitting device 8, which will be described later. Guide vanes 10, 1 attached to each stem on the waterway side
1 and 12 are the gap 1 as shown in FIGS. 4 and 5.
Correspondingly arranged through 3. The main torque transmitting device 8 has a structure in which the transmitted torque can be adjusted by the tightening force of a bolt (not shown). The main torque transmitting device 8 is designed to transmit a torque larger than the steady operating force to prevent excessive stress from occurring in the levers and links and breakage of the links and levers, such as when a foreign object is caught between the guide vanes. When this happens, slipping occurs in this area. However, the main torque transmitting device 8 has a torque transmitting force that is greater than the swinging torque generated in the guide vanes 10 to 12 due to the water flow flowing between the guide vanes, and during steady operation, the guide vanes are kept at a predetermined opening degree. ing.

Next, the operation of each guide vane 10 to 12, for example, when closing will be explained.

Drive the servo motor 5C to move the guide ring 5.
When B is rotated in the counterclockwise direction W', the link 5A and the guide lever 7 are moved in the clockwise direction W via the connecting pin 6, and the stem 4 and the guide vanes 10 to 10 are rotated.
12 rotates clockwise to close the gap 13 between the guide vanes and restrict the flow of water to the runner 3. If the operation is reversed to that described above, the rotation of each guide vane 10 to 12 will cause the gap 13 to
becomes larger and water flows through the gap 13 to the runner 3, causing it to rotate.

[Problem that the invention attempts to solve]

The foreign matter 14 carried by the water closes the gap 13 as shown in FIGS. 4 and 5, and the one guide vane 1
0 and the other guide vane 11, a foreign object 14 is sandwiched between the guide vane 11 and the other guide vane 11. In this state, servo motor 5C
When the guide vanes 10 and 11 are rotated clockwise and closed by the driving force of If this happens, for example, the main torque transmitting device 8 on the guide vane 11 side will idle on the stem, causing a sliding phenomenon, and the torque will not be transmitted to the stem 4, and the guide vane 1 will move beyond the normal fully open position due to the pressing force of the foreign object 14. The inner end of the guide vane 11 collides with the rotating runner 3.

In addition, because the guide vanes were operated in the closing direction with a foreign object caught between the guide vanes, slipping occurred between a particular stem and the guide lever, and when the guide vanes were operated in the opening direction to release the foreign object, the guide vanes slipped. Since the guide vane that is experiencing this is opened further by the amount of slippage, there is a risk that the inner end of the guide vane may come into contact with the runner. especially,
In recent years, the distance between the runner 3 and each guide vane 10 to 12 has been reduced to reduce the size.
The above-mentioned problems are likely to occur.

An object of the present invention is to provide a water turbine guide vane protection device that prevents damage to guide vanes and runners.

[Means for solving problems]

A guide vane lever is attached to the stem between the upper cover and the guide lever, and an auxiliary torque transmitting device having a friction force greater than that of the main torque transmitting device is interposed between the stem and the guide vane lever. The guide vane lever and the stopper prevent the guide vane lever from opening in the opening direction beyond the normal fully open position.

[Effect]

As a result, even if slippage occurs between the stem and the guide lever, the rotation of the guide vane can be restricted to a position where it does not come into contact with the runner, so damage to the guide vane and the runner can be prevented.

〔Example〕

Embodiments of the present invention will be described below with reference to FIGS. 6 to 9.

A guide vane lever 21 is inserted into the stem 4 between the upper cover 1A and the guide lever 7 via an auxiliary torque transmitting device 20. Sub-torque transmitter 20
The diameter of the stem 4 corresponding to the main torque transmitting device is larger than the diameter of the stem 4 corresponding to the main torque transmitting device. Further, the sleeve 22 inserted between each torque transmitting device 8, 20 and the stem 4 in FIG. It is formed larger than the diameter. As a result, the frictional force of the main torque transmitting device 20 is greater than the frictional force of the auxiliary torque transmitting device 8. The stopper 23 is attached to the upper cover 1A, and when the guide vanes 10 to 21 are about to move beyond the normal fully open position in the opening direction,
It is provided at a position where it engages with the guide vane lever 21 and restricts further displacement.

With this configuration, as shown in FIG. 9, with a foreign object 14 sandwiched between one guide vane 10 and the other guide vane 11, each guide vane 10 to 12 is moved clockwise by the driving force of the servo motor 5C. When the guide vane 10 and the guide vane 11 are rotated in the direction W and closed, the pressing force of the foreign object 14 sandwiched between the guide vane 10 and the guide vane 11 becomes larger than the frictional force of the main torque transmitting tool 8. The torque transmitting tool 8 idles on the stem, causing a sliding phenomenon, and is no longer transmitted to the stem 4. Furthermore, when the guide vane is operated in the closing direction, the guide vane 11 attempts to rotate in the opening direction beyond the normal fully open direction due to the pressing force of the foreign object 14, but the guide vane lever 21
is engaged with the stopper 23, and the guide vane 11
will not rotate any further in the opening direction, so
The inner end of the guide vane 11 does not collide with the rotating runner 3.

Further, after slipping occurs between the guide vane 11 and the stem due to the pressing force of the foreign object 14 sandwiched between the guide vane 10 and the guide vane 11, the guide ring 5B and each guide vane 10 to 12 are opened. the foreign object 1 between both guide vanes.
4, the guide vane lever 21 also collides with the stopper 23. At this time, since the frictional force of the auxiliary torque transmitting device 20 is larger than the frictional force of the main torque transmitting device 8, the guide vane lever 21 maintains the state in which it collides with the stopper 23, and the main torque transmitting device 8 idles on the stem. The guide vane 11 is prevented from rotating in the opening direction, and the guide vane 1 is
1 can be prevented from colliding with the rotating runner 3.

[Effect of idea]

Therefore, the guide vane 11 and the runner 3
damage can be prevented.

[Brief explanation of drawings]

Figure 1 is an assembled side sectional view of a conventional water turbine, Figure 2 is an assembled sectional view of a guide vane stem and guide vane lever in the prior art, Figure 3 is a plan view of Figure 2, and Figures 4 and 5. The figures are explanatory diagrams of conventional guide vane protection devices, Figures 6 and 7.
The figure is a sectional view of a guide vane protection device according to an embodiment of the present invention, FIG. 8 is a plan view of FIG. 6, and FIG. 9 is an explanatory diagram of the guide vane protection device of the present invention. 1A, 1B...Cover, 2...Waterway, 3...Runner, 4...Stem, 5A...Link, 6...Connection pin, 7...Guide lever, 8...Main torque transmitter, 10-12 ... Guide vane, 20 ... Sub-torque transmitter, 21 ... Guide vane lever, 2
3...stopper.

Claims (1)

[Scope of utility model registration request] A plurality of guide vanes that can be opened and closed are arranged in a waterway formed between the upper cover and the lower cover, a rotatable stem that is equipped with the guide vanes and is supported between both covers, and the upper cover. It consists of a guide lever inserted into a stem that extends upward, a main torque transmitter placed between the stem and the guide lever, and a guide ring connected to the other end of the guide lever via a link. , a guide vane device that transmits rotational force from a guide ring to a stem and a guide vane via a link and a guide lever, and adjusts the amount of water to a water turbine runner by changing the opening degree of the guide vane. A guide vane lever is attached to the stem between the stem and the guide vane lever, and an auxiliary torque transmitting device having a friction force greater than that of the main torque transmitting device is interposed between the stem and the guide vane lever, so that the guide vane is in the normal fully open position. 1. A water turbine guide vane protection device comprising: a stopper that engages with the guide vane lever to restrict displacement of the guide vane in the opening direction when the guide vane is opened in the opening direction.